长江河口北槽非均匀泥沙起动分析

20世纪80年代后期以来,长江河口的北槽被开辟为上海港的入海通道,深水航道工程也在此修建,现在长江口的深水航道工程一期工程已经结束,一期工程后的航道治理的效果如何,其主要指标之一是看航道泥沙的落淤的程度,泥沙回淤港池的动力条件很复杂,而多种动力条件引起的泥沙起动也是判断河槽冲淤的重要特性之一.利用一期工程结束后2003年长江河口北槽枯季调查的资料和窦国仁、张瑞瑾、唐存本的泥沙起动公式,计算长江河口北槽的泥沙起动流速,并对结果和实测值进行了对比,得到深水航道所在的北槽底部泥沙的流速远大于该地泥沙的起动流速,故河槽将进一步加深,向更有利的方向发展.

THE ANALYSIS OF THRESHOLD MOTION FOR NON-UNIFORE SEDIMENT IN NORTH PASSAGE OF CHANG JIANG ESTUARY

The north passage of Changjiang estuary where the deep waterway was constructed was opened as the channel of Shanghai port about at 1980'.Now the waterway project 1 has been finished. If we want to know the effects, we should regard the starting velocity of un-uniform sediment as the important parameter which many dynamic factors affect, therefore researching the velocity in north passage has important meaning. This paper not only calculate the starting velocity by the data of 2003 dry season after the waterway project 1 and the starting velocity formulas of Douguoren,Zhangruijin,Tangcunben ,but also analyze the result with actual measurement. We get the conclusion that the bottom velocity in north passage is much greater than the starting velocity and the river channel will develop well for navigation.